Bloodletting is the withdrawal of often considerable quantities of blood from a patient to cure or prevent illness and disease. It was the most common medical practice performed by doctors from antiquity up to the late 19th century, a time span of almost 2,000 years.
In the overwhelming majority of cases, the historical use of bloodletting was harmful to patients. But, bloodletting has not died a death – it is still one of the most effective treatments of excess iron in the bloodstream and for treatment of excess red blood cells which can occur in diseases such as porphyria. In the old method, the patient was cut and a suction cup was placed over the wound to draw out blood. In modern times syringes are used.
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